Elastic Sound Waves by Alessandra Larocca

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Slide Notes

Elastic Sound Waves

Published on Nov 19, 2015

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PRESENTATION OUTLINE

PERCEPTION

ELASTIC SOUND WAVES

Sound waves are simplified to a description in terms of sinusoidal plane waves.

A wave is a trivelling disturbance and it carries energy from one place to another.

TRANSVERSE WAVES
The direction of the disturbance is perpendicular to the direction motion.

LONGITUDINAL WAVES

The direction of the disturbance is parallel to the direction of the waves motion.

SPATIAL DEPENDENCE

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Wavelength is a spatial period of the wave in the direction motion.

Amplitude is the maximum displacement of a particle from its undisturbed position.

Photo by Wessex Archaeology

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TIME DIPENDENCE

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Period is the time required for one complete cycle.

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MATEMATICAL DESCRIPTION OF WAVES

This equation rapresents the displacement of a particle for a wave travelling in the positive x direction with an amplitude A, frequency f and wavelenght λ.

This equation assumesse that y=0 m when x=0 m and t=0 s and aplies equally to transverse or longitudinal waves

EXERCISE

THERE ARE 5 CRESTES IN 50 SECOND, HOW MANY CRESTES ARE THERE IN 1 SECOND?

Alessandra Larocca